Tax breaks for married couples will not be included in next month’s Budget, a senior government source has revealed.

David Cameron was expected to announce the move in a bid to appease Tory backbenchers who are opposed to the party’s gay marriage plans.

The prime minister’s stance risks further angering party members disillusioned by the government’s failure to introduce the breaks so far.

Under the proposals, one member of a married couple or civil partnership would be allowed to transfer £750 of their tax-free personal allowance to their partner.

George Osborne will deliver the Budget next month (Picture: Getty)

The tax breaks, which were pledged in the Conservative general election manifesto, are still set to be introduced by introduced before the 2015 general election.

‘It won’t be in the Budget but it will be in this Parliament,’ the source said. ‘This Budget obviously, with all that has happened in recent weeks and months, will be very much focused on growth in the economy.’

The developments came amid fevered speculation over plots to oust the prime minister, with MP Adam Afriyie dismissing reports he is being groomed as the next Tory leader.